Evidence for Strong-coupling S-wave Superconductivity in MgB2 :11B NMR Study

Preprint

19 February 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0102334

Abstract

We have investigated a gap structure in a newly-discovered superconductor, MgB2 through the measurement of 11B nuclear spin-lattice relaxation rate, ^{11}(1/T_1). ^{11}(1/T_1) is proportional to the temperature (T) in the normal state, and decreases exponentially in the superconducting (SC) state, revealing a tiny coherence peak just below T_c. The T dependence of 1/T_1 in the SC state can be accounted for by an s-wave SC model with a large gap size of 2\Delta /k_BT_c \sim 5 which suggests to be in a strong-coupling regime.

Keywords

WAVE SUPERCONDUCTIVITY
STRONG COUPLING
SUPERCONDUCTING
SUPERCONDUCTOR
NMR STUDY
11B NMR
1/T_1
MGB2

All Related Versions

Version 1, 2001-02-19, ArXiv
Published version: Physical Review Letters, 87 (12), 127001.

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